Federal and state authorities, however, are investigating whether the company has accurately reported results of water-quality testing.
Concerns about the company's testing prompted the Indiana Department of Environmental Management to conduct its own tests last fall.
Although the agency said it found no violations of safety standards, Thomas Easterly, head of the department, expressed concern that the readings showed higher concentrations of disinfection byproducts than the company had reported from its own tests for at least four years. The trace chemicals "raise a potential health concern," Easterly said.
Hewitt said he was confident the probe would find no wrongdoing.
Indianapolis is a showpiece for Veolia as it markets itself around the world, he said, and the company wouldn't jeopardize such an important contract by cutting corners.
"We have a lot at stake here," he said. "When our senior managers go to Beijing, they talk about Indianapolis. When they go to India, they talk about Indianapolis."
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Times researcher Janet Lundblad contributed to this report.